The Staff of Motorsport Marketing
The Staff of Motorsport Marketing Writer
5/22/20 8:47 a.m.

Story by Lane Borg

A straightforward question came up as we worked on our Corvette Z06 project car: What are the rates for leaf springs–both OEM and some popular replacements?

So we asked Lane Borg, a mechanical engineer, Formula SAE instructor, Goodyear test driver and owner of Borg M…

Read the rest of the story

Coupefan
Coupefan Reader
5/22/20 2:48 p.m.

I'm still freaked out over their design choice. I know they work, like the old vacuum tubes we see in some audio gear, but still, I'm freaked out by the use. 

David S. Wallens
David S. Wallens Editorial Director
5/22/20 3:57 p.m.

In reply to Coupefan :

You know, maybe the vacuum tube analogy is a good one. (Says the guy sitting beside two tube amps.)

Appleseed
Appleseed MegaDork
5/23/20 10:44 p.m.

I wonder if you could go old school and stack leafs to change the rates?

Cooter
Cooter UberDork
5/24/20 9:04 a.m.

In reply to Appleseed :

You could conceivably make multileaf packs, but then you end up with all of the downsides of a multileaf pack.

Pete. (l33t FS)
Pete. (l33t FS) MegaDork
5/24/20 9:36 a.m.
Coupefan said:

I'm still freaked out over their design choice. I know they work, like the old vacuum tubes we see in some audio gear, but still, I'm freaked out by the use. 

There are a lot of dynamic as well as packaging benefits to their use.

wspohn
wspohn Dork
5/24/20 11:30 a.m.

Hey - as I type this I am sitting in front of a tube power amp fed by a tube preamp. Nothing wrong with tubes (or valves as the British call them), and certain military gear has long used tubes because they are much less problematic in an EMP (electromagnetic pulse) from a nuclear explosion.  The fact that Russian planes used tubes extensively for that purpose accounts for the continued popularity of Russian made (usually Sovtec) tubes in hi-fi.

(I also have a couple of systems that use 120 lb Class A mono solid state amps, so I go both ways). The irony is that my tube power amp puts out 70 W while my Class A amps put out 45 W (but they do it right down to 1 ohm).

 

BTW - very interesting spring article - thanks.

randyracer
randyracer New Reader
11/4/21 12:55 p.m.

This is verrrrry interesting to me, but so far only talks about the spring rate in ride.  Whatb happens in roll as the weight transfers into and thru the corner is what I'm most fascinated by, and this article is only a teaser of that.  Argh!  I'll be panting for the next one.  I have never been a fan of the C7 chassis, and I suspect these variable wheel rates under load may be the reason why the car feels unpredictable to me.  I am also curious about the choice of the transverse leaf in the first place, given its foibles.

 

A GM engineer I met while testing press cars for a magazine told me (as I recall...) that in roll, the unloaded side of the transverse leaf is still affecting the loaded side, and that the wheel rate varies with travel.  It is not linear.  I believe I feel this when driving the C7 hard.

 

Thank you GRM staff and Lane Borg, great stuff and cant wait for the spring rates in roll story!

 

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